Highly-active charcoal



Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

HEINZ THIENEMANN, OF LEVERKUSEN, NEAR GOLOGNE-ON-THE'RHINE, GERMANY,

ASSIGNOR 1'0 FAIRIBENFABRIKEN VORIL' FRIEDB. BAYER AND 00., F LEVER- KUSEN, NEAR COLOGNE-ON- THE-RHINE, GERMANY.

HIGHLY-ACTIVE CHARCOAL.

No Drawing. Original application filed March 15, 1923, Serial No. 625,424. Divided and this application flied February 17, 1925. Serial No. 9,867.

To all whom it may concern Be it known that I, I-Innvz THIENEMANN, a citizen of Germany, residing at Leverkusen, near Cologne, State of Prussia, Ger- 5 many, have invented new and useful Improvements in a Highly-Active Charcoal, of which the following is a specification.

I have found that a highly active charcoal distinguished by high resistivity topressure and disintegration which ensure a minimum of wastage can be obtained, by preparing a homogeneous plastic mass from finely groundbrown coal and impregnating materials such as concentrated solutions of inorganic salts or acids which can be easily washed out after calcining, extruding the paste into single thread-like products or the like as for instance through a thread press or into briquettes as for instance through a briquetting machine, and subjecting these firm structures to a calcining process. The charcoal obtained is then washed as usual, dried and sieved. It is noted that one can control to a certainextent the grain size of the charcoal obtained by altering, the size of the dies of the press.

As an example, 16 parts by weight of finely ground brown coal are mixed with 16 parts by Weight of a 50% phosphoric acid solution in a kneadin machine and are then extruded through a thread press using dies of 5 mm. diameter. The mass obtained is put through a rotary furnace and after r drying is calcined in a mufile furnace. The pieces of charcoal obtained show a good adsorption capacity and great rigidity.

.cal with t at which may be The drying and ca-lcinin of the threads can be combined in one an the same operation by using a rotary gas heated furnace fitted with gas heating. If care is taken that the combustion gases are free from oxygen and that the heating temperature "does not exceed 700 there is practically no pact bodies, and drying and calcining the bodies.

2. As a new product a highly active char coal in the form of ins of high ri 'dity andabso tion capacity substantially .i entlhereindescribed process w ch comprises forming a pasteof finely ground brown eoal and a solution containg an inorganic acid radical, forming the paste into compact bodies, and dryin and calcining the bodies.

In testimony w ereof I have hereunto set my hand.

HEINZ THIENEMANN.

ppepared by the 

